the man who helped prepare romney for his primary debate brett o'donnell. o'donnell also preparing john mccain for his debate against president obama. he tells bill o'reilly what mitt romney will need to do in order to come out on top tonight. listen to this. >> the burden in the debate is on the governor, or am i wrong? >> i think you are absolutely right. while the challenger gets elevated by being on the stage with the president clearly the president is on the mountain top. he won the last set of debates. there has to be a compelling reason for change. governor romney has the burden of proof. >> you prepped john mccain for his debate with barack obama. mccain held his own but didn't bring the debate to the president mccain never brought it to him. this guy doesn't know what he is talking about he is talking in generalities but that didn't get through to the electorate who liked obama and still likes obama. >> that is one of the reasons he has to go on offense. >> we will see tonight. coverage starts at 8:55 eastern time with megan kelly and bret baier. they will be live from denver.